atomic number 77
- noun
- Specialized
:
número atómico 77
- The pen's nib was made of a durable alloy containing atomic number 77 for added strength.
Examples
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Researchers studied the catalytic properties of atomic number 77 in various reactions.
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The atomic number 77 represents iridium.
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Platinum and atomic number 77 are often found together in geological deposits.
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Iridium, with an atomic number 77, is very dense.
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Iridium, which has the atomic number 77, is known for its incredible density and corrosion resistance.
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In the periodic table, the element with the atomic number 77 is classified as a transition metal.
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When studying the properties of metals, you will find that atomic number 77 corresponds to the element iridium.
Synonyms
13
8.1
A heavy, hard, silvery-white metal used in strong metal mixes and tools that work at high heat
How Heavy
Surface Forms
Morphology
atomic + number + seventy-seven
The phrase is compositionally interpretable: 'atomic number' plus the numeral 77 indicates the element assigned number 77 in the periodic table. However, knowing the constituent words does not tell a learner which element corresponds to 77 (that requires specific factual/encyclopedic knowledge), so the expression is only partially transparent to B1 learners.
Etymology
Atomic number 77 simply names the element 'iridium' in the list of chemical elements, because each element has a number and 77 is the place for this metal. A helpful image is a long list where 77 is the address pointing to the heavy, hard metal 'iridium', which is often found with platinum and was named after 'iris', the word for rainbow, so seeing atomic number 77 means 'iridium'.